Expression for time in terms of (universal gravitational constant), (Planck's…

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Problem

Expression for time in terms of

G

(universal gravitational constant),

h

(Planck's constant) and

c

(speed of light) is proportional to: (1)

\sqrt{\frac{hc^5}{G}}

(2)

\sqrt{\frac{c^3}{Gh}}

(3)

\sqrt{\frac{Gh}{c^5}}

(4)

\sqrt{\frac{Gh}{c^3}}